package com.alibaba.middleware.race.rpc.tool;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.objenesis.Objenesis;
import org.objenesis.ObjenesisStd;

import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtobufIOUtil;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;

public class Tool {
	private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<>();

    private static Objenesis objenesis = new ObjenesisStd(true);

    private Tool() {
    }

    @SuppressWarnings("unchecked")
    private static <T> Schema<T> getSchema(Class<T> cls) {
        Schema<T> schema = (Schema<T>) cachedSchema.get(cls);
        if (schema == null) {
            schema = RuntimeSchema.createFrom(cls);
            if (schema != null) {
                cachedSchema.put(cls, schema);
            }
        }
        return schema;
    }

    /**
     * 序列化（对象 -> 字节数组）
     */
    @SuppressWarnings("unchecked")
    public static <T> byte[] serialize(T obj) {
        Class<T> cls = (Class<T>) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try {
            Schema<T> schema = getSchema(cls);
            return ProtostuffIOUtil.toByteArray(obj, schema, buffer);
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        } finally {
            buffer.clear();
        }
    }

    /**
     * 反序列化（字节数组 -> 对象）
     */
    public static <T> T deserialize(byte[] data, Class<T> cls) {
        try {
            //T message = (T) objenesis.newInstance(cls);
            T message=(T) cls.newInstance();
            Schema<T> schema = getSchema(cls);
            ProtostuffIOUtil.mergeFrom(data, message, schema);
            return message;
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
	/*
	private static Objenesis objenesis = new ObjenesisStd(true);
	public static<T> byte[] encode(T obj, Class<?> clazz)
	{
		//Class<T> clazz = (Class<T>) obj.getClass();
		Schema<T> schema = RuntimeSchema.getSchema((Class<T>)clazz);
		LinkedBuffer buffer = LinkedBuffer.allocate(4096);
		byte[] buff=ProtostuffIOUtil.toByteArray(obj, schema, buffer);
		return buff;
		
	}
	
	public static<T> T decode(byte[] bytes,Class<?> clazz)
	{
		//T obj=null;
		//T obj = (T) objenesis.newInstance(clazz);
		T obj=null;
		try {
			obj = (T) clazz.newInstance();
			Schema<T> schema = RuntimeSchema.getSchema((Class<T>)clazz);
			ProtobufIOUtil.mergeFrom(bytes, obj, schema);
		}
		catch (Exception e) 
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return obj;
	}*/

}
